How does one create an animated skeleton which can be applied to any model?
If two models share the armature (one armature is a clone of the other, with exactly the same loc, rot, scale and name of every single bone), the task is absolutely easy: create a dope sheet window, turn it into an "Action editor", select the second armature and select the action you made for the first model: in this way the two armatures will perform the same animation. If the two armatures are not clones, you will need a procedure called "retargeting", wich is not so easy, you will have to make some researches about it.